A couple of great recordings that are wonderful to hear and really bring out everything in your system are 1) Holly Cole, "Baby, It's Cold Outside" (2001 Alert Music 6152810382) and 2) David Benoit, "Christmastime" (1983 AVI Record Productions R279161). Honest to goodness, these are good enough to be reference recordings to use while analyzing components. Plus, and more importantly, they are a great listen.
Many of the Narada Christmas Collection cds are also quite good (e.g., 1988 Narada Productions "Narada Christmas Collection" ND-63902 and the 1992 "Volume 2" ND-63909).